JWCMA,
I only got about 2.5 - 3 years out the fan but it performed so well that i'm willing to get the same. I, too, have a Fluidyne radiator and i had to cut the mounting bars that sticks out from the side so that they are flush with the fans. No big deal.
I first had it wired so that i can turn the fans on manually. But after a ton of times of forgetting to turn them on (engine overheating) AND forgetting to turn them off (dead battery), i had it wired so that the "low" setting will always be on. I can go to the "high" setting manually via the switch.
The only times that i ever used the "high" setting was when i would forget to turn on the fan; the temperature gauge on the red! It's good to have that option, especially when it's a hot day.
I would wire yours the same I have mine - "Low" setting is on all the time while I have the option to use the "high" settings via the switch.
I'm not sure why the bearings went out after only a few years. At first, the fans would squeek but after a while they started to vibrate. I did nothing to them in terms of maintenance, however. Maybe i should oil my new fan every now and then?
I placed my order, this morning. The company that sells them appear to be prompt. I should receive my new fan in 3 days.
http://shop.smmenterprises.com/index.asp?PageAction=VIEWPROD&ProdID=187489
I got the fan without the wiring harness. If the design is indeed the same as the Ramcharger, I can transfer the old harness over to the new unit.